Why are you posting the question in Alameda, but you're in Vancouver
Depending on your location....are you talking about flowering pots in a balcony overlooking someone else's balcony or patio? In that case, if I were the landlord, I'd say no, to, for safety purposes.
Pictures on the wall --- this is very common. If you hang pictures, then you'll be liable for damage to the walls. I.e, you'll have to patch up walls and repaint in order to restore the property in good condition when you leave.
Windchimes would be considered annoying/noisy to other neighbors, too.
So you probably should either suck it up, or find another place to live.